Calculate: C = pi times r.
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320. use a calculator. (:
The formula for circumference is Pi x D= Circumference. If you know the circumference you solve for the diameter as you would any other variable. Let's say the circumference is 10, the equation would then be: Pi (3.14) x D = 10. Solve for D. D= 10/3.14
0.0001
APEX: 46.47 - 46.5cm
pi*D So pi*15 here. If you've a scientific calculator (or set the calculator probably in your computer in "Accessories" somewhere, to 'Scientific'), it will have a pi key. But do you mean the circumference of the 15" dimension or is that pipe bore but you want the outside circumference? If the latter you'd need its outside diameter - there will be an appreciable difference!